Mold apparatus

Abstract

A mold apparatus includes a first mold plate formed with a runner flow path, a second mold plate, a runner stripper plate having a through hole that communicates with the runner flow path, a runner locking part formed with an inverse tapered space which communicates with the through hole and has an inverse tapered shape and in which a locking portion made of a molding material is formed, and a runner unlocking means for moving the runner stripper plate away from the runner locking part to unlock the locking portion.

What is claimed is: 
     
       1. A mold apparatus, comprising:
 a first mold plate formed with a runner flow path through which a molding material supplied from a sprue flow path flows, a gate through which the molding material supplied from the runner flow path flows, and a part of a cavity space which is filled with the molding material supplied from the gate and in which a molded product is molded; 
 a second mold plate formed with a part of the cavity space and relatively moving in a mold opening/closing direction with respect to the first mold plate; 
 a runner stripper plate having a through hole that communicates with the runner flow path; 
 a runner locking part formed with an inverse tapered space that communicates with the through hole and has an inverse tapered shape, wherein a locking portion made of the molding material is formed in the inverse tapered space; and 
 a runner unlocking device moving the runner stripper plate away from the runner locking part to unlock the locking portion. 
 
     
     
       2. The mold apparatus according to  claim 1 , further comprising:
 a first attaching plate which is an attaching plate on the side of the first mold plate; 
 a sprue bush formed with the sprue flow path; and 
 a second attaching plate which is an attaching plate on the side of the second mold plate, 
 wherein the runner stripper plate is provided between the first attaching plate and the first mold plate. 
 
     
     
       3. The mold apparatus according to  claim 2 , further comprising a runner locking plate provided between the first attaching plate and the runner stripper plate,
 wherein the runner locking part is provided in the runner locking plate. 
 
     
     
       4. The mold apparatus according to  claim 3 , further comprising a runner locking plate moving device moving the runner locking plate in a mold opening direction to form a predetermined gap between the first attaching plate and the runner locking plate. 
     
     
       5. The mold apparatus according to  claim 2 , wherein the runner locking part is provided in the first attaching plate. 
     
     
       6. The mold apparatus according to  claim 1 , further comprising:
 a first base mold; 
 a sprue bush provided in the first base mold and formed with at least a part of the sprue flow path; 
 a base intermediate mold loaded with the first mold plate; and 
 a second base mold loaded with the second mold plate, 
 wherein the runner stripper plate is provided between the first base mold and the first mold plate. 
 
     
     
       7. The mold apparatus according to  claim 6 , further comprising a runner locking plate provided between the first base mold and the runner stripper plate,
 wherein the runner locking part is provided in the runner locking plate. 
 
     
     
       8. The mold apparatus according to  claim 7 , further comprising a runner locking plate moving device moving the runner locking plate in a mold opening direction to form a predetermined gap between the first base mold and the runner locking plate. 
     
     
       9. The mold apparatus according to  claim 6 , wherein the runner locking part is provided in the first base mold. 
     
     
       10. The mold apparatus according to  claim 1 , wherein the runner unlocking device comprises a runner stripper plate driving device that moves the runner stripper plate in a mold opening direction. 
     
     
       11. The mold apparatus according to  claim 1 , wherein the runner unlocking device comprises:
 a tension link connecting the first mold plate and the second mold plate to limit a degree of opening between the first mold plate and the second mold plate; 
 a puller bolt having a head portion for locking the first mold plate; and 
 a stop bolt having a head portion for locking the first base mold, 
 wherein the runner stripper plate is interposed between and connected with an end portion of the puller bolt and an end portion of the stop bolt.